group has used. the question is, will this be successful? in the midst of the fight we have seen backlash against this by the opposition forces who want to just see western support without this sort of qualification. >>shepard: the defense secretary and others suggest that maybe they backing off the use chemical weapons idea but if you corner a dog you wonder what it will do and if this chances upon his head, how sure can we be. >>guest: our red line has shifted. we said movement of chemical weapons and now we say "use" use of chemical weapons or any kind of weapons of mass destruction is a suicidal act by a regime like this. it will push us to enter reason and you would thing that would be it. i would not say it is off the table if the regime is desperate, i don't think we can put much beyond assad given his track record. >>shepard: 40,000 dead later, who knows? thank you. the neighborhood watch volunteer who says he shot and killed an unarmed teenager in central florida is not going anywhere. a jud